Delete your account in the app
The fastest way is inside Dunno itself. Open the app, go to Settings, then Data Controls, and under Deletion tap Delete Account.
Tick the confirmation box and confirm. The account and its data are removed straight away, and the app carries on as a signed-out visitor. Deletion cannot be undone.
If you never signed in, there is no account to delete. Dunno creates an anonymous session so that search and price comparison work immediately; it holds no name, email address or sign-in identity, and removing the app removes what is stored on the device.